[Webkit-unassigned] [Bug 89475] New: Blur causes issues when scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=89475

           Summary: Blur causes issues when scrolling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: keyar at chromium.org
                CC: svillar at igalia.com


Created an attachment (id=148340)
 --> (https://bugs.webkit.org/attachment.cgi?id=148340&action=review)
Demonstrates the scrolling blur bug. No red should be visible if the scrolling worked.

Having blur on the entire page will result in incorrect rendering when the page is scrolled if one div is scrolled underneath another.

Set a <div> tag set to use "-webkit-filter: blur(#px)" where # is any number, including zero.
Within this div, have two divs such that one will scroll underneath the other (such as having one with fixed position). Give the child divs two separate background colours.
Scroll the page and the rendering will be incorrect. See attached file for an example page that displays this problem (if there was no issue, the page will not have red).

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